aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorKevin Buettner <kevinb@redhat.com>2015-11-16 14:58:07 -0700
committerMike Frysinger <vapier@gentoo.org>2015-12-29 19:17:11 -0500
commit90d99f327063af7d87c61234896d4a1dbe073a43 (patch)
treec923eb23efc0a03a712e18501eeab0959b3ed37b
parent090d9d00b51cf130973f01770cd1712e768f1d87 (diff)
downloadgdb-90d99f327063af7d87c61234896d4a1dbe073a43.zip
gdb-90d99f327063af7d87c61234896d4a1dbe073a43.tar.gz
gdb-90d99f327063af7d87c61234896d4a1dbe073a43.tar.bz2
sim: ppc: track closed state of file descriptors 0, 1, and 2.
This change tracks the "closed" state of file descriptors 0, 1, and 2, introducing the function fdbad() to emul_netbsd.c and emul_unix.c. Note that a function of the same name and purpose exists in sim/common/callback.c. This patch eliminates all of the "unresolved testcases" when testing GDB against the powerpc simulator. This occurs because the powerpc simulator closes, on behalf of the testcase, the file descriptors associated with stdin, stdout, and stderr. GDB still needs these descriptors to communicate with the user or, in this case, with the testing framework.
-rw-r--r--sim/ppc/ChangeLog14
-rw-r--r--sim/ppc/emul_netbsd.c78
-rw-r--r--sim/ppc/emul_unix.c81
3 files changed, 151 insertions, 22 deletions
diff --git a/sim/ppc/ChangeLog b/sim/ppc/ChangeLog
index 413a99d..7ce9a47 100644
--- a/sim/ppc/ChangeLog
+++ b/sim/ppc/ChangeLog
@@ -1,3 +1,17 @@
+2015-12-29 Kevin Buettner <kevinb@redhat.com>
+
+ * emul_netbsd.c (fd_closed): New static array.
+ (fdbad): New function.
+ (do_read, do_write, do_close, do_dup, do_ioctl, do_dup2, do_fcntl)
+ (do_fstatfs, do_fstat, do_lseek): Call `fdbad'.
+ (emul_netbsd_init): Initialize `fd_closed'.
+ * emul_unix.c (fd_closed): New static array.
+ (fdbad): New function.
+ (do_unix_read, do_unix_write, do_unix_close, do_unix_dup)
+ (do_unix_dup2, do_unix_lseek, do_solaris_fstat, do_solaris_ioctl)
+ (do_linux_fstat, do_linux_ioctl): Call `fdbad'.
+ (emul_solaris_init, emul_linux_init): Initialize `fd_closed'.
+
2015-12-26 Mike Frysinger <vapier@gentoo.org>
* Makefile.in (TCONFIG_H): Delete.
diff --git a/sim/ppc/emul_netbsd.c b/sim/ppc/emul_netbsd.c
index 6bef370..12dfb21 100644
--- a/sim/ppc/emul_netbsd.c
+++ b/sim/ppc/emul_netbsd.c
@@ -292,6 +292,31 @@ write_rusage(unsigned_word addr,
}
#endif
+
+/* File descriptors 0, 1, and 2 should not be closed. fd_closed[]
+ tracks whether these descriptors have been closed in do_close()
+ below. */
+
+static int fd_closed[3];
+
+/* Check for some occurrences of bad file descriptors. We only check
+ whether fd 0, 1, or 2 are "closed". By "closed" we mean that these
+ descriptors aren't actually closed, but are considered to be closed
+ by this layer.
+
+ Other checks are performed by the underlying OS call. */
+
+static int
+fdbad (int fd)
+{
+ if (fd >=0 && fd <= 2 && fd_closed[fd])
+ {
+ errno = EBADF;
+ return -1;
+ }
+ return 0;
+}
+
static void
do_exit(os_emul_data *emul,
unsigned call,
@@ -339,7 +364,9 @@ do_read(os_emul_data *emul,
status = -1;
}
#endif
- status = read (d, scratch_buffer, nbytes);
+ status = fdbad (d);
+ if (status == 0)
+ status = read (d, scratch_buffer, nbytes);
emul_write_status(processor, status, errno);
if (status > 0)
@@ -374,7 +401,10 @@ do_write(os_emul_data *emul,
processor, cia);
/* write */
- status = write(d, scratch_buffer, nbytes);
+ status = fdbad (d);
+ if (status == 0)
+ status = write(d, scratch_buffer, nbytes);
+
emul_write_status(processor, status, errno);
free(scratch_buffer);
@@ -440,8 +470,20 @@ do_close(os_emul_data *emul,
SYS(close);
- /* Can't combine these statements, cuz close sets errno. */
- status = close(d);
+ status = fdbad (d);
+ if (status == 0)
+ {
+ /* Do not close stdin, stdout, or stderr. GDB may still need access to
+ these descriptors. */
+ if (d == 0 || d == 1 || d == 2)
+ {
+ fd_closed[d] = 1;
+ status = 0;
+ }
+ else
+ status = close(d);
+ }
+
emul_write_status(processor, status, errno);
}
@@ -549,7 +591,7 @@ do_dup(os_emul_data *emul,
unsigned_word cia)
{
int oldd = cpu_registers(processor)->gpr[arg0];
- int status = dup(oldd);
+ int status = (fdbad (oldd) < 0) ? -1 : dup(oldd);
int err = errno;
if (WITH_TRACE && ppc_trace[trace_os_emul])
@@ -640,7 +682,9 @@ do_ioctl(os_emul_data *emul,
|| dir & IOC_OUT
|| !(dir & IOC_VOID))
error("do_ioctl() read or write of parameter not implemented\n");
- status = ioctl(d, request, NULL);
+ status = fdbad (d);
+ if (status == 0)
+ status = ioctl(d, request, NULL);
emul_write_status(processor, status, errno);
#endif
@@ -681,7 +725,7 @@ do_dup2(os_emul_data *emul,
{
int oldd = cpu_registers(processor)->gpr[arg0];
int newd = cpu_registers(processor)->gpr[arg0+1];
- int status = dup2(oldd, newd);
+ int status = (fdbad (oldd) < 0) ? -1 : dup2(oldd, newd);
int err = errno;
if (WITH_TRACE && ppc_trace[trace_os_emul])
@@ -711,7 +755,9 @@ do_fcntl(os_emul_data *emul,
printf_filtered ("%d, %d, %d", fd, cmd, arg);
SYS(fcntl);
- status = fcntl(fd, cmd, arg);
+ status = fdbad (fd);
+ if (status == 0)
+ status = fcntl(fd, cmd, arg);
emul_write_status(processor, status, errno);
}
#endif
@@ -796,7 +842,9 @@ do_fstatfs(os_emul_data *emul,
printf_filtered ("%d, 0x%lx", fd, (long)buf_addr);
SYS(fstatfs);
- status = fstatfs(fd, (buf_addr == 0 ? NULL : &buf));
+ status = fdbad (fd);
+ if (status == 0)
+ status = fstatfs(fd, (buf_addr == 0 ? NULL : &buf));
emul_write_status(processor, status, errno);
if (status == 0) {
if (buf_addr != 0)
@@ -849,7 +897,9 @@ do_fstat(os_emul_data *emul,
SYS(fstat);
#endif
/* Can't combine these statements, cuz fstat sets errno. */
- status = fstat(fd, &buf);
+ status = fdbad (fd);
+ if (status == 0)
+ status = fstat(fd, &buf);
emul_write_status(processor, status, errno);
write_stat(stat_buf_addr, buf, processor, cia);
}
@@ -951,7 +1001,9 @@ do_lseek(os_emul_data *emul,
int whence = cpu_registers(processor)->gpr[arg0+4];
off_t status;
SYS(lseek);
- status = lseek(fildes, offset, whence);
+ status = fdbad (fildes);
+ if (status == 0)
+ status = lseek(fildes, offset, whence);
if (status == -1)
emul_write_status(processor, -1, errno);
else {
@@ -1450,7 +1502,9 @@ static void
emul_netbsd_init(os_emul_data *emul_data,
int nr_cpus)
{
- /* nothing yet */
+ fd_closed[0] = 0;
+ fd_closed[1] = 0;
+ fd_closed[2] = 0;
}
static void
diff --git a/sim/ppc/emul_unix.c b/sim/ppc/emul_unix.c
index d72525d..1475474 100644
--- a/sim/ppc/emul_unix.c
+++ b/sim/ppc/emul_unix.c
@@ -195,6 +195,30 @@ struct unix_rusage {
};
+/* File descriptors 0, 1, and 2 should not be closed. fd_closed[]
+ tracks whether these descriptors have been closed in do_close()
+ below. */
+
+static int fd_closed[3];
+
+/* Check for some occurrences of bad file descriptors. We only check
+ whether fd 0, 1, or 2 are "closed". By "closed" we mean that these
+ descriptors aren't actually closed, but are considered to be closed
+ by this layer.
+
+ Other checks are performed by the underlying OS call. */
+
+static int
+fdbad (int fd)
+{
+ if (fd >=0 && fd <= 2 && fd_closed[fd])
+ {
+ errno = EBADF;
+ return -1;
+ }
+ return 0;
+}
+
static void
do_unix_exit(os_emul_data *emul,
unsigned call,
@@ -232,8 +256,10 @@ do_unix_read(os_emul_data *emul,
/* check if buffer exists by reading it */
emul_read_buffer(scratch_buffer, buf, nbytes, processor, cia);
+ status = fdbad (d);
/* read */
- status = read (d, scratch_buffer, nbytes);
+ if (status == 0)
+ status = read (d, scratch_buffer, nbytes);
emul_write_status(processor, status, errno);
if (status > 0)
@@ -266,8 +292,10 @@ do_unix_write(os_emul_data *emul,
emul_read_buffer(scratch_buffer, buf, nbytes,
processor, cia);
+ status = fdbad (d);
/* write */
- status = write(d, scratch_buffer, nbytes);
+ if (status == 0)
+ status = write(d, scratch_buffer, nbytes);
emul_write_status(processor, status, errno);
free(scratch_buffer);
@@ -310,7 +338,20 @@ do_unix_close(os_emul_data *emul,
if (WITH_TRACE && ppc_trace[trace_os_emul])
printf_filtered ("%d", d);
- status = close(d);
+ status = fdbad (d);
+ if (status == 0)
+ {
+ /* Do not close stdin, stdout, or stderr. GDB may still need access to
+ these descriptors. */
+ if (d == 0 || d == 1 || d == 2)
+ {
+ fd_closed[d] = 1;
+ status = 0;
+ }
+ else
+ status = close(d);
+ }
+
emul_write_status(processor, status, errno);
}
@@ -490,7 +531,7 @@ do_unix_dup(os_emul_data *emul,
unsigned_word cia)
{
int oldd = cpu_registers(processor)->gpr[arg0];
- int status = dup(oldd);
+ int status = (fdbad (oldd) < 0) ? -1 : dup(oldd);
int err = errno;
if (WITH_TRACE && ppc_trace[trace_os_emul])
@@ -512,7 +553,7 @@ do_unix_dup2(os_emul_data *emul,
{
int oldd = cpu_registers(processor)->gpr[arg0];
int newd = cpu_registers(processor)->gpr[arg0+1];
- int status = dup2(oldd, newd);
+ int status = (fdbad (oldd) < 0) ? -1 : dup2(oldd, newd);
int err = errno;
if (WITH_TRACE && ppc_trace[trace_os_emul])
@@ -540,7 +581,9 @@ do_unix_lseek(os_emul_data *emul,
if (WITH_TRACE && ppc_trace[trace_os_emul])
printf_filtered ("%d %ld %d", fildes, (long)offset, whence);
- status = lseek(fildes, offset, whence);
+ status = fdbad (fildes);
+ if (status == 0)
+ status = lseek(fildes, offset, whence);
emul_write_status(processor, (int)status, errno);
}
#endif
@@ -1196,7 +1239,9 @@ do_solaris_fstat(os_emul_data *emul,
if (WITH_TRACE && ppc_trace[trace_os_emul])
printf_filtered ("%d, 0x%lx", fildes, (long)stat_pkt);
- status = fstat (fildes, &buf);
+ status = fdbad (fildes);
+ if (status == 0)
+ status = fstat (fildes, &buf);
if (status == 0)
convert_to_solaris_stat (stat_pkt, &buf, processor, cia);
@@ -1433,6 +1478,10 @@ do_solaris_ioctl(os_emul_data *emul,
#endif
#endif
+ status = fdbad (fildes);
+ if (status != 0)
+ goto done;
+
switch (request)
{
case 0: /* make sure we have at least one case */
@@ -1474,6 +1523,7 @@ do_solaris_ioctl(os_emul_data *emul,
#endif /* HAVE_TERMIOS_STRUCTURE */
}
+done:
emul_write_status(processor, status, errno);
if (WITH_TRACE && ppc_trace[trace_os_emul])
@@ -1925,7 +1975,9 @@ static void
emul_solaris_init(os_emul_data *emul_data,
int nr_cpus)
{
- /* nothing yet */
+ fd_closed[0] = 0;
+ fd_closed[1] = 0;
+ fd_closed[2] = 0;
}
static void
@@ -2124,7 +2176,9 @@ do_linux_fstat(os_emul_data *emul,
if (WITH_TRACE && ppc_trace[trace_os_emul])
printf_filtered ("%d, 0x%lx", fildes, (long)stat_pkt);
- status = fstat (fildes, &buf);
+ status = fdbad (fildes);
+ if (status == 0)
+ status = fstat (fildes, &buf);
if (status == 0)
convert_to_linux_stat (stat_pkt, &buf, processor, cia);
@@ -2388,6 +2442,10 @@ do_linux_ioctl(os_emul_data *emul,
#endif
#endif
+ status = fdbad (fildes);
+ if (status != 0)
+ goto done;
+
switch (request)
{
case 0: /* make sure we have at least one case */
@@ -2429,6 +2487,7 @@ do_linux_ioctl(os_emul_data *emul,
#endif /* HAVE_TERMIOS_STRUCTURE */
}
+done:
emul_write_status(processor, status, errno);
if (WITH_TRACE && ppc_trace[trace_os_emul])
@@ -2795,7 +2854,9 @@ static void
emul_linux_init(os_emul_data *emul_data,
int nr_cpus)
{
- /* nothing yet */
+ fd_closed[0] = 0;
+ fd_closed[1] = 0;
+ fd_closed[2] = 0;
}
static void